the.com/elastin

The protein that lets your skin snap back, until one day it just doesn't.

means A stretchy structural protein in connective tissue that lets skin, lungs, arteries, and ligaments stretch and then recoil back to shape.

from Coined in the 1800s from Latin/French 'elastic' (itself traced back to Greek 'elastikos', meaning propulsive or driving) plus the chemist's suffix '-in' used to name proteins and other isolated substances — so the name is literally 'the springy stuff,' tagged like any other protein once biochemists pulled it out of tissue and gave it a label.

lifespan
lasts decades, barely gets replaced after puberty
stretch factor
can stretch 150 percent and recoil fully
decline cause
sun and time degrade it, not just age
found in
skin, lungs, arteries, and vocal cords alike
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